Automatic washing machine electrical control system



Oct. 6, 1953 s. B. WELCH ET AL 2,654,239

AUTOMATIC WASHING MAcHlNE ELECTRICAL CONTROL SYSTEM Filed April 24, 1951 2 Sheets-Sheet l /f Wf'fiff e J`//a Mw J l L-J l l Inventors:

Stank-39 B. Welch, Eugehe G. Olthus,

Their* Attorn'e'.

Oct. 6, 1953 s. B. WELCH ET AL 2,654,239

AUTOMATIC WASHING MACHINE ELECTRICAL CONTROL SYSTEM Filed April 24, 1951 2 Sheets-Sheet 2 "1 LI LJ LI LI m m @AMY I n l Inventors: Stanley B.Welc h, Eugene G. Olthus,

Their` Attorheg.

Patented Oct. 6, 1953 UNITED STATES ATENT OFFICE AUTOMATIC WASHING MACHINE ELEC- TRICAL CONTROL SYSTEM Application April 24, 1951, Serial No. 222,688

12 Claims.

This invention relates to an improved control circuit for the operation of a machine having a plurality of electrically energized mechanisms which function automatically in a predetermined time sequence. For example, the circuit may be applied to an automatic clothes washing machine in which water at preselected temperature is supplied to the machine at proper times and the machine is conducted through a series of operational cycles which may include a washing period, removal of wash Water, a rinse period and a final Water extraction period.

It is an object of our invention to provide an improved control circuit which will function eiciently to accomplish a desired sequence of control steps.

It is a further object of our invention to provide a sequence control circuit with a minimum number of control elements, thereby simplifying the control and its components, reducing maintenance problems, and establishing the assembly wiring and testing requirements of the circuit and its components within the capabilities of unskilled. labor.

Broadly speaking, we accomplish the above noted objectives with conventional elements, such as a standard timer motor driven cam switch bank, solenoid actuated Water control valves, and a fractional horsepower reversible drive motor arranged in a novel circuit predicated upon impedance relationships in which the timer motor impedance is greater than that of the water valve solenoids and the latter in turn have an impedance greater than that of the drive motor.

Other features and advantages of our invention will be apparent from the following detailed description read in the light of the accompanying drawings which show a presently preferred em" bodiment of our invention applied to a domestic washing machine. Fig 1 of said drawings is a sectional elevation of a washing machine of the centrifugal extraction type; Fig. 2 is a fragmentary sectional plan View showing an arrangement of the electrically energized hot and cold Water valves; Fig. 3 is a representation of a circuit embodying our invention, the cam actuated switches for operating the same being shown schematically; and Fig. 4 is a chart showing the operation of the cam at any particular instant during the operating cycle.

Referring to Fig. 1 of the drawings, there is provided an outer casing I of a clothes washing machine within which is secured a suitable tub- 2. While the tub 2 is shown as a resilient structure supported from the upper part of the casing I, it will be understood that it may be of metal or plastic vand supported in any suitable manner. Within the tub is a basket 3 in which the clothes are placed to be washed by -oscillation of an agitator 4. During the washing operation, the basket is held stationary. Thereafter, the cleansing liquid is centrifugally extracted from the clothes by rotating the basket at high speed. During this extraction operation, the basket and agitator are rotated as a unit and the liquid is discharged through openings 5 at the baskets upper edge. This water is collected in and later removed from the tub 2. The basket and the agitator are respectively mounted on concentric independently rotatable shafts 6 and 1. The basket shaft 6 is attached to a gear frame S journaled for rotation within a casing 9 suitably carried by a stationary supporting structure It. The gear frame is journaled in the base plate II of the casing and is arranged to be rotated therein by a shaft I 2 concentric with shaft and provided with a sheave I4. A gear train I5 includes means for translating rotation of a drive pinion I6 into oscillation of a gear I'I keyed to the shaft 1. Such mechanisms are Well known; seel for example, the similar gear train in McNairy Patent 2,462,657, which is owned by the General Electric Company, assignee of the present application. Drive pinion I5 is formed on the upper end of a shaft I8 journaled within shaft I 2 for rotation relative thereto; to the lower end of shaft I8 is affixed a sheave I9. Power for agitation and spin is supplied by a reversible drive motor 20 having a conventional start winding 20a, a running or main winding 20h, and a centrifugal cutout switch 20c for the start winding, as shown in Fig. 3. The motor 2U operates through directionally responsive clutch means 2l which has an agitate clutch 22 adapted to be connected to sheave I9 and a spin clutch 23 adapted to be connected to sheave ifi. When the drive motor is rotated in the agitate direction only clutch 22 is driven and motive power is supplied to gear train I5 to oscillate the agitator. The gear frame 8 is held against rotation in the direction of sheave IS by a snubber or brake member 24 carried on casing 9 and engaging the sheave I4. When the motor is oppositely rotated only spin clutch 23 is driven and it drives the sheave I4 and its associated gear frame il is rotated to rotate basketA 3. The snubber 24 is so constructed as to be ineffective to restrain rotation in the spin direction. Agitator 4 rotates idly with the basket. The direction responsive clutch mechanism and snubber and their operation above described are more particularly shown and described in the pres- -ently pending application of Jacob W. McNairy,

Serial No. 164,427, led May 26, 1956, for Drive Clutch for Washing Machines or the Like and owned by the General Electric Company, assignee of the present application..

The motor is directly coupled to a direction responsive pump 25, the inlet of which is connected. to the bottom of the tube 2 to draw 'water from the tub and discharge it. through any suitable conduit 26. The pump may be. of' the type described and claimed in the presently pending application of Carl R. Sehens, Serial No. 156,802, filed April 19, 1950, for Centriiugal Pump and owned by the General Electric Company, assignee of the present application. Such a pumpproduces a substantial positive pumping head when operated in one direction and a negative head for opposite rotations; when the motor is rotating in the agitate ydirection the pump will generate. a negative head and, will not remove water from the tulo..

Water is supplied from a suitable external source directly to the basket 3. Pursuant to conventional practice the washing machine contains solenoid operated valves 2T, 2d intended respectively for connection to a cold water and a hot water source and feeding into a common. spout 28 which reaches over the top of the basket to discharge thereintor as shown in Figs. l and' 2.

The several operations which. collectively make up the entire washing operation are under the control of a motor driven program controller suitably mounted on the machine convenient to the operator. This program controller which we have generally identied by the reference character 3d in Fig. 3 may embody a cam bank and switch arrangementv similar to that described and claimed in the Newell Patent 2,481,333, granted September 6, 1.941, for Electric Switch Mechanism.

Such a switch has a suitably indexed dial 3i, a plurality of cams 32, 33, 34, and a timer motor 3.6. These cams, including the dial 3i (which also is. a cam) are also 'designated by the numerals I, II, III, and V, as. shown in lig.l 3, for easier reference to the cam chart. of Fig. 4. The respective. cams and indicating dial are. keyed on the motor driven shaftv 3l and the. mechanism is such that the dial 3|. may be manually operated to advance the. tim-ing system to any selected operating position or, as is frequently desirable, to shorten any particular operation cycle.

In each of the cams of. 32, 314. and 35, the. high portions represen-t operative positions associated with spin drying and the low portions represent operative positions related to clothes washing. It will be noted that cams 34 and 35 may be identical, which eiiects a considerable economy. The circuit includes a manually operable double pole single throw switch 38 pursuant. to. which the operator may optionally use. only hot water or a fixed mixture. of hot and cold water for washing. Regardless. of the Wash water temperature selection, the xed mixture will be supplied for rinsing because the cam follower on the periphery of dial 3| automatically will cause both poles of switch 38 to close after the i'lrst iill. The poles of said switch are designated 38a, and 38h, respectively, and. to choose the hot and cold mixture for washing, the operator merely closes the contact 38o manually, using a suitable lever, not shown, the yupper arm of switch 38 being movable to closed position independently of the lower arm.

The circuit also includes a single pole double throw switch di), of any conventional snap action type, having contacts 40a and 4Gb and which is arranged to be actuated by a lever M (Fig. 1) responsive to the level of water Within tub 2. In the schematic circuit representation of Fig. 3, it is assumed that the lower contacts 40a are bridged when the tub is empty and that the upper contacts. 4217 are bridged when the water level reaches a predetermined maximum. Suitable means for operating such a switch are shown and describedV in the presently pending application of' John Bochan, Serial No. 160,857, filed May 9, 1950, for a Pressure Responsive Control Switch for Washing Machines and the Like, and owned by the General Electric Company, assignee of the present invention.

Cams 32, 34, and 35 each operate single pole, double throw switches. The lower contacts of each switch carry the identication number of the cam with the subscript A (for agltate) and the upper contacts have subscripts S (for spin). Cam 33' operates a single pole single throw switch 33a'. The circuit is connectable to a source of electrical energy, for example, volts 60 cycle A. C., by a conventional plug P. The main leads of the circuit comprise the supply conductor i2 and the return conductor 43.

The impedance of timer motor 36v is made greater than that of the water valve solenoids 2l, 28 and they, in turn, have an impedance greater than that oi the drive motor 2U, The several cams are in the position of Fig. 3 when the operator has rotated dial 3i, which also causes rotation of shaft 31, from oli position to ll position. This may be to any position within the space marked Fill-Agitate, the p0- sition depending upon the agitating time desired. The switch actuator of cam 32 has dropped oif the high portion of the cam; the switch actuator of cam 33 has entered onto the high portion of its, cam; and the switch actuators of cams 34 and 35 have dropped oil` the high portions of their cams. The fact that. the manually operable switch 38 is in the position shown with pole 38a open indicates that, thev operator has chosen to use hot water at line temperature for washing. The machine then begins to ll with hot water by reason of ,the following circuit: from the plug P through conductors 42, 44 to the bridged pole 32A of cam 32, conductors 45, 4E to hot water solenoid 28, conductors 41, Q8 to the bridged empty position contacts 40a of water level responsive switch 48, conductors 5B, Fil to the bridged contacts 33a oi" cam conductors 52, 53 to the main winding 2Gb of motor 20 and through return conductor 3. Because the impedance of solenoid coil 28 is much higher than that of the drive motor, and the timer motor is in parallel with the drive motor, which, by the way, offers a parallel return path for the solenoid circuit just described, practically full line voltage is drawn across the coil 2.5 and water is admitted, but neither the timer motor nor the drive motor will start. Thus it will be seen that during the iill period the control cams are not turned. I-Iad the operator chosen to use a mixture of hotl and cold water for washing, pole 38a of switch 38 would have been closed manually before starting the machine, whereupon the branch circuit 54, 55 would have connected cold water solenoid 21 in parallel with the solenoid 28 across the conductors 45, 48.

Water is supplied to the basket 3 and soon overiiows through holes 5 into tub 2. As the water rises therein to a predetermined level, switch il opens contacts 40a and closes contacts 4Gb, removing coil 28 from the circuit and thereby permitting the water valves to close. Timer motor 36 is energized through conductors 5i, closed contacts lib and conductors 50, 58. The main winding 20h of drive motor 2c is energized in a circuit including conductors 52 and 5E as before, and start winding 23a is energized in a circuit including conductors 52, 60, bridged contacts 34A, conductor 6I, the normally closed centrifugal switch 2te, winding 2Go, bridged contacts 35A land conductors 62, 53, to return conductor 43. Thus, the start and run windings of the drive motor are in parallel circuit relationship with the timer motor, and, consequently, when the coil 2S is removed from the circuit both motors are energized despite the difference in their relative impe-dances. The timer motor 35 begins to drive the program controlling cams a counterclockwise direction and the drive motor begins oscillating the agitator il through clutch 22, sheave I9, shaft I8, gear train I5, and shaft This is the beginning of the time responsive operations, as best illustrated by the carn chart of Fig. 4. The portion. of the wash cycle labeled agiytate in Fig. 4 includes both the fill and agitate space on the dial 3i. Agitation in the manner explained above, as soon as the doa-t valve closes the contacts Mib. The timer does not start driving the cams until after the initial fill. The agitation part of the wash cycle may include approximately one-third of the total space on the periphery of the cams, as shown on the cam chart, or considerable varia-tions from this amount depending on the washing machine to which it is adapted and the amount of the selective time differences to be made available for the user. For example, the user may have a choice, when he rst turns the dial 3l, of washing times varying from ve to twenty minutes.

When the drive motor has reached a predetermined speed, the centrifugal switch 2de opens, thereby removing the start winding from the circuit in the usual well-known manner.

Before the agitation cycle has been completed the cam follower riding on the periphery of the dial SI enters onto the high portion, closing both poles of switch 33 to insure that a iixed mixture of cold and hot water is supplied to the basket for subsequent lls. The closing of #this switch also provides an alternate path for power from conductor s2 to conductor i whenever the contacts 32A are opened and contacts 32S are closed. Because the pump 25 does not function as a pump when the motor 2i! is turning' in its agitato direction, the water collected in the tub 2 has not been removed and the water level responsive switch d@ still has its contacts dab closed. Consequently, no water can be supplied to the basket at this point in the cycle.

As the timer continues to rotate the cams, the follower of cam 33, or lil as shown on the cam chart, drops oi the high portion of the cam, thereby opening the contacts of switch 33a. This interrupts the energizing circuit for the main winding 2019 of the drive motor 2G, thereby ending agitation as the motor and its driven mechanism coasts |to a stop. This interruption permits switch 20c to again close.

During this pause period the timer motor 36 remains energized and continues to rotate the cams, and substantially simultaneously the cam followers for cams 35, 32, and 34 (I, II, and IV as seen on the cam chart) enter on Ithe high portion of their respective cam peripheries, thereby opening the switch contacts 35A, 32A, and 34A and closing contacts 35S, 32S, and 34S. The timer remains energized, since the float switch contacts 40h remain closed, and the main winding 29D of the drive mo-tor is not re-energized because the switch 33a remains open. The opening of contacts 34A and 55A and the closing of contacts 36S and 35S, however, connect the start winding 2te in the opposite direction from the connection previously described, but the start winding is not energiaed until switch 33a, is closed.

When the time allotted for the short pause period is over, the cam follower riding on the periphery of cam 33, or III as shown in the chart, enters onto the high portion, thereby closing switch 33a. This completes the reversed connection circuit for the start winding, including conducto-rs 42 and 54, closed contact 3th, conductors 65, 56, 46, and 5l', the bridged contacts 4Gb, conductors 5i) and 5I, switch 33a, conductors 52, 53, and 66, the bridged contacts 35S, conductor 61, winding 20a, switch 29o, conductor' 6I, bridged contacts 34S, conductors 68 and d3, and return conductor 43. Also completed is a main winding circuit comprising conductors 42 and G4, closed contact 38h, conductors S5, 5d, 45, and 5l, the bridged contacts liiib, conductors 5d and 5 i switch 33a, conductors 52 and 53, winding 2th, and return conductor 13. Completion of these circuits starts the motor in the opposite direction of rotation froin agitato, and initiates the spin cycle. The basket is rotated through the clutch 23, the sheave I4, the shaft I2, the gear frame t, and the shaft 6. The pump 25 is no-w driven in the direction in which it develops a positive pumping head, so that the water in the tub 2 is continually eX- hausted as the wash water is thrown out oi the basket ports 5 by centrifugal action and into the tub. In a short time, the water level in the tub 2 will be below that necessary to maintain the switch contacts 4to bridged.

As the motor 2li comes up to speed, thecentrifugal switch 20c opens, removing the start winding from the motor circuit.

At the same time the motor circuit described above is completed, an auxiliary circuit is completed through conductors 42 and fis, the bridged contacts 38D, conductors 65, 54, and 45, bridged conductors 32S and conductor E59 to the connection of conductors 50 and 5I This latter circuit connects with the reversed start circuit and main winding circuit just described and serves as the source of their energization after the switch contacts 40h are opened upon the exhaustion of water in the tub 2. This circuit also serves to shunt the circuit completed upon the closing of contacts dilo, also upon exhaustion of the water in the tub 2, and prevents the energization oi the solcnoids 2l and 28 which control the inlet water valves.

The spin portion of the cycle continues until the cam follower for cam 33 drops into its next depression. As best shown in Fig. Li, the cam 33, or III, is provided with a depression of about twice the peripheral length of its previous depression, which Yinitiated the first pause period. The switch 33a is opened, interrupting the drive motor circuit. The timer motor is in series with the solenoids 2l and 28. vAlthough switch 33a has interrupted the solenoid shunting circuit, the

the basket .with Water atftiie beginning of this lpheral Speedaof the-vbaslret'isso great that the,

ing or ifraying of; theclothes.

`the centrifugal switch 2te closes and 'later'. duringp the Coast period the cams 35, 32,; and 34 (I, II, a-ndVIV as shown in Eig. 4) rotate toa point where F F.thegrespective camiollowersdrop down upon loaT portions o fthe'. cam -peripheriess Consequently,

. era-tetu initiateanethr; fil-1Vv perations.-Filline coast period would .be undesirable, sincefthe pe,.

; Water sprayfrornthe nozzle l2 9 might cause tear ,.f

A33a and. interrupting... the drive motor circuit- .Y t--Shortlyafterthebeginning o i .the coa-stl periodp ...The timer motonlofcourse, remains undisturbed.

and contacts A, 32A, and 34A are; closed. This. A prepares thecircuits yforthe start i/vinding 2i3a,.

klofswitcircand the contacts AMib, Abythe same.

circuits as in the case ofthe earlieragitateperiod, with the .start Winding connections opposite to ,that described orthe-Spin periodic v.filthouglfl the contacts lle are still closed, there beinano Water fin the YtubE 2, the Water valve solenoids `do vnot .tion With-the timermotor.

The coast periodends when the Acani followe j-so that theywill bepenerg-zed, upon Y the closing 2c forthe dial SL01 ca mj] as .shoivn on the cam ,chanrails into a loiv portionon its periphery.

j operatebecause they are still'in direct series rela- Y -forgeam 33, or Illas seen in Figfipis elevated once again to a ,high portion-of the cam pef -riphery, .thereby closing switch 33a. Both water. valves lare immediately opened to begin illing the .....ianarallel with that ...through bridged esmtacts 32A, so that thecrenirisnf. ifrll. interrupt neitherthe timer rior the drive motoroperation,

The. end .of the vsecond or rinse agitate period f orcam in .Fig. 4), thereby opening the switch Thisinitiates the second pausejperiod, the coastingto a stopof the motor and mechanism being coast followinghspinning. Die Second .0r .rinsesrin .operation is initiated 15.

inthe Stime. manner and u singthe same circuits as the initial o r wash spin operation previously .described The onlyyariation occurs at the end ci this extraction period in that following the 4 Qpe r 1ing. oisvvitch 33gt to deenergize the drive motor theswitcli 3 3 opens when the cani follower Ihisperrnits the operatorto choose whether hot Wash water. forth@ next washinarr .alcixiure 0f the dial manually -from the o i position to the ll positionl switch contacts 35A and 313A are .ciosed, then switch is closed', and finally contacts 32A are closedto preparethe circuits for another iilling. operationand Wash agitato pebasket 3 With a mixture of hot andcold water by reason of the follow-ing circuit: 4fronithe plug P Y throughconductorsALM. to Contact hthrough v4conductor and then alternately through eithery contact 38a; conductor 55 .andcold water sole- .incid coil v2? or conductors. 5th-46, hot water soles,

noid-ccil 28, and conductor A?, and then to conductor 43, contacts lita, conductors Se, iii to the bridgedeontacts asa, conductance; 53 te the mainwinding 2th of motor E@ -andthrough rei i 1.turncondmctor 43 back to Fplug -P.,; AItvvill be noted that,A just as for the first lhperiod, the timer circuit oiersa parallel return path for the water valves.- circuit -just Adescribed;Toy con-1.

l 4dutors 50,;58, timer motor ASe, and` conductor 43, `to theplug R. Ccnsequently,-the impedance of the Water valve solenods, beingigreater than that of the drive motoiyisfgreater ,than the parallel ,circuitincluding the drive-motor andthe timer .,moto1', and. suii'icientvoltage drop across-the solee riod to begin. the Washing ci another clothes load.

Whilewe have shown a particular 'embodi- .ment oi our invention, it will b e understood, of course, that We do ^no t vvisl1 to be limited thereto, since many modifications mayb-e made; and We thereforecontemplate by vthe appended claims. to cover any ysuch modications as fall Within the true spiritand scope of ourinvention. What we claim as new and desire to secure oy l Letters Patent of the UnitedStates is:

1. Ina plothes Washing machine having an electric drive motorand .electrcresponsive liquid supply 1neans control vmeans vfor Ysaid drive motor and said supplyineans comprising an electric timer motor, a plurality7 ofrotatalcle cams driven b y said timer motor, a drive motor circuit, a liquid supplyrneans circuit, a timer motor circuit, switches in said circuits .controlled .by said cams, manually.. operable.. means for initially rotating .said cams to actuate a plunoids isolotainedtoenergize them3 f, thereby openv A e ingv the inlet water.- valves. f Since the start v/ind-Mv i ing Roisin iparallelvrelaticnship witnthe main Awinding 2ib, its .effect is merelyto, further lessen..

u. the impedance of -tlie drive motor .and timer s motor. circuit. Thus, the Water valvesare opened,

Y abut sincepracticallyiull line voltage is drawn across the Water valve solenoids, neither the drive -motor nor the timer mOtor-Wil1-= operate. The

ralityoi said switches to estabiisiiacontrol cir cuit comprising said drive motor Ycircuitand said timer motor circuit in parallehrelationto each other and saidA liquid supply circuit in series relation thereto; .tl ie said liquid supply means circuit having electricai impedance substantially greater than the impedance of theparallel circuit branch comprising said driveand timer motor circuits wherebysad liquid supply means cams will remain stationary, thereforeuntil tl1e, s Water in the outer tub .2 reachesa sufficient depth 1. to .actuateithe swtchsdddopening contacts Mia,

to remove the water valve solenoidsromthe circuit. Upon .the opening of. contacts im of the Water '.1 thereby establishing'the ;identical ti1ne r.and drive motor-circuits thatAwereused atY the end ci the onlyis operated upontheenergization of said controlcircuit,v and meansiQr removing said liquid. supply means circuit from saidcontrol circuit to effect operation of said drive rnctor to initiate Washingand of said timer motor toA initiate rotation of said cams.

responsive valve dflvfcontacts @0b .Wi1l,. be closed,

2. In aplotheswashing machinehaving an electric drive motor and electroresponsive Wa- I0 f -iirst rlll and the beginning otlie initial agitate.

,. operation. In addition, acircuit comprising conductors 42, 64, closed contact 3819, conductors 65, se, 54, 46, S'ifbridged contacts 49h and .conductor 5G, is established to form v`an alternate supply 1path ter supply means; control means comprising an electric timer motor, a drive. motor circuit, a timer motor circuit in parallel relation With said drive motor circuit, anda water supplycircuit in series relation with saiddrive and timer motor cuit being greater than the impedance of said drive and timer motor circuits in parallel so that said water supply means only is operated upon the energization of said circuits, and Water responsive switch means for interrupting said water supply circuit and establishing an alternative circuit to said drive and timer motor circuits to operate said drive motor and said timer motor.

3. In a clothes Washing machine having a driving motor and electroresponsive liquid supply means, control means for said motor and said supply means comprising a timer motor, a plurality of cams rotatably driven by said timer motor, switch means operated by said cams, manually operable means for rotating said cams to operate said switch means, a circuit closed by said cam-operated switch means comprising said drive motor and said timer motor in parallel relationship and said liquid supply means in series relationship therewith, the impedance of said liquid supply means being substantially greater than the impedance of the parallel circuit branch including said timer and driving motors so that substantially the full line e voltage is drawn across said liquid supply means, and switch means responsive to an accumulation of liquid in the clothes washing machine for interrupting said liquid supply circuit and establishing a shunt circuit to said timer and driving motor parallel circuit to operate said timer mo-V tor and said driving motor.

4. In a clothes washing machine having a clothes basket with washing means therein, a

liquid collecting tub substantially surrounding said basket, an electric drive motor for said bashet and said washing means, and electroresponsive liquid supply means for said basket, control means comprising an electric timer motor, a cam drum driven by said timer motor, switch means operated upon initial manual rotation of said cam drum to effect a circuit comprising said drive motor and said timer motor in parallel relationship and said liquid supply means in series relationship therewith, the impedance or said liquid supply means being substantially greater than the impedance oi the parallel circuit branch including said drive and timer motors so that substantially the full line voltage is drawn across said liquid supply means to operate said means, and a switch located in said tub responsive to the depth of liquid accumulated therein during operation of said water supply means for interrupting said supply and for establishing an alternate circuit branch in series with said drive and timer motor circuit branch to initiate operation of said motors.

5. In a clothes washing machine, having a spin basket, washing means in the basket, an electric drive motor for driving selectively said basket and said washing means, and electroresponsive liquid supply means for said basket, the impedance of said liquid supply means being substantially greater than the impedance of said drive motor, control means comprising an electric timer motor the impedance of which is substantially greater than the impedance of said liquid supply means, a plurality of cams driven by said timer motor, switch means operated by said cams, an electric circuit eiected by said switch means upon rotation of said cams comprising a rst branch including in parallel said liquid supply means and a low impedance conductor, a second branch including in parallel said drive and timing motors, means connecting said branch circuits in series,

means eiected by said switch means for inter'- rupting the circuit through said drive motor and the circuit through said low impedance conductor to place said liquid supply means directly in series with said timer motor whereby said timer motor only is operated, and means eiected by said switch means for re-establishing a circuit through said drive motor in parallel circuit relation with the circuit through said timer motor whereby said liquid supp-ly means only is operated.

6. n a clothes washing machine, having a spin basket, washing means in the basket, an electric drive motor for driving selectively said basket and said washing means, and electroresponsive liquid supply means for said basket, the impedance of said liquid supply means being substantially greater than the impedance of said drive motor, control means comprising an electric timer motor the impedance of which is substantially greater than the impedance of said liquid supply means, a plurality oi cams driven by said timer motor, switch means operated by said cams, an electric circuit effected by said switch means upon rotation of said cams comprising a iirst branch including in parallel said liquid supply means and a 10W impedance conductor, a second branch including in parallel said drive and timing motors, means connecting said branch circuits in series, means effected by said switch means for interrupting the circuit through said drive motor and said low impedance conductor to place said liquid supply means directly in series with said timer motor whereby said timer motor only is operated, means eiiected by said switch means for re-establishing said drive motor circuit in parallel circuit relation with said timer motor circuit whereby said liquid supply means only is operated, and means independent of said timer driven cams for interrupting the circuit through said liquid supply means and establishing in place thereorn a relatively low impedance conductor in series with said drive and timer motor branch circuit whereby said drive and timer motors are operated.

7. In a clothes washing machine having an electric drive motor, an electroresponsive hot water supply valve, and an electroresponsive cold water supply valve; control means comprising an electric motor driven timer, a drive motor circuit and a timer motor circuit in parallel, a hot water valve circuit and a cold water valve circuit in parallel, means actuated by said timer for connecting the parallel drive motor and timer motor circuits in series with the parallel hot water and cold water circuits, manually operable means including a water temperature selector switch for completing said cold Water valve circuit, automatic means for interrupting said parallel circuits including said valves and establishing in place thereof a low impedance circuit in series with said motor circuits, and means including switch means associated with said water temperature selection switch automatically operable by said timer to complete an alternate low impedance circuit in series with said motor circuits.

3. In a clothes washing machine having an electric drive motor for performing washing operations and electrically operated valve means for supplying water to the machine, the impedance of said electrically operated valve means lbeing substantially greater than the impedance of said drive motor, ai control means comprising a drive motor circuit, a valve operating circuit, a timer, and electric switches operated by the timer for connecting said drive motor circuit and said valve operating circuit in series to effect operation of said valve means to'supp'ly Water to the machine, u the drive motorremainingstationarydue to' its* 9. In a clothes washing machine having an elec-Y tric drive motor for performing Washing' operationsI a'wate'r supply valve vand electromagnetic means for operating the supply valve, the impedance of said electromagnetic means being sub- Y stantially greater than the impedance of said drive motor, control means 'for said drive motor and said electromagnetic meanscomprising a timer motor having 'an` impedance substantially higher'than that of said'electromagneticmeana an electromagnetic means circuit, a drivernotor circuit, a timer motor circuit, switch means actuated bythe timer motor for connecting the timer motor circuit and the Vdrive motor circuit in parallel with each other and in' series with the electromagnetic means circuit to Yei'ect -opening of said supply valve, the relative impedance values of theA drive motor, the electromagnetic'means and the 'timer motor being such that the` drive motor and the timer motor will not beoperated,

and switch means actuated bythe, timer motor for opening the drive motor circuit and connecting the electromagnetic means and the timer motor in series, the relative impedance or" the electromagnetic means and the' timer motor jbeing such that the timer motor is operated but the Water valve is not operated for performing a step in the Washing cycle.

10. In an automatic Washingmachine', mecha-y nism for performing Washing operations, a valve for supplying water to the machine, a drive motor for operating said mechanism, electromagnetic means for operating said valve, a timer motor, said drive motor, timer motor and electromagnetic means having relative impedances such that when the electromagnetic means is connected in A.)

series circuit with parallel circuits through the drive motor and the timer motor only the `electromagnetic means is operated and when the electromagnetic means is connected in series circuit with the timer motor only the timer vmotor is operated, and means including switches operated' by the timer motor for effecting suchcircuitconnections during automatic operation of thewashing machine.

for supplying Water to the machlg, 'a drivemotor said drive motor, `tirrier motor and electromag 1 rieti@ meanshavingrelativeimpdaeceSuhihei L When the electromagnetic means is connected f series circuit with parallel circuits through the" drive motorand the timer motor only the electro:

magnetic means is operatedand when the elec# tromagnetic means is connected irr series circuit with the timer motor only the timer motcr"is' operated, and means including a svvitch A'operatedin response to the amountof. Water -in the Wash- 115, e e e .Y

mg machine and switches operated by the timer motor for effecting such circuit connections during automatic operation of thewashing machine, 1 2, In an vautomatic Washing machine, mecha# 2Q nism orperformmg Washing operations, a valve for supplying. Water@ the machine, a drive motor `for operating said mechanism, electromagnetic means for operating saidvalVe, a timer motor,"" Asaid drive motor, timer motor and electromag netic means having relative impedances suchthat" when the electromagnetic means is connectedfin series circuit with parallel circuitsA through 'thef drive motorand the timermotor only the electromagnetic means isA operated and Whenthe elecJ` tromagnetic means 'is connected in Iseries circuit" with the'timer motor only the timer ir`iotor "is operated, and-means including a 'timer 'motor"` operated switch in the drive motor c`rcu it for i effecting such circuit connections during ,auto- .35 matic operatio'of the Washingma'chine whereby` .loy opening such sii/itchV the drive motor circuit" may be opened andthe timer motor continued in' operation without eiectifr'ig operation of 'said electromagnetic means to admit' water 'to -the" 40 machine.

EUGENE G. OLTHUIS.

UNITED STATES PATENTS Y 11. m an automatic"'wlinelhiiihaha? nism for performing vvashingoperations, a val v e References cited in theieie' oftmpatent 

